17899611990 has 32 divisors (see below), whose sum is σ = 46263613536. Its totient is φ = 4406058240.

The previous prime is 17899611949. The next prime is 17899611997. The reversal of 17899611990 is 9911699871.

It is a super-2 number, since 2×17899611990² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (17899611997) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 22947831 + ... + 22948610.

It is an arithmetic number, because the mean of its divisors is an integer number (1445737923).

Almost surely, 2^17899611990 is an apocalyptic number.

17899611990 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

17899611990 is an abundant number, since it is smaller than the sum of its proper divisors (28364001546).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

17899611990 is a wasteful number, since it uses less digits than its factorization.

17899611990 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45896464.

The product of its (nonzero) digits is 2204496, while the sum is 60.

The spelling of 17899611990 in words is "seventeen billion, eight hundred ninety-nine million, six hundred eleven thousand, nine hundred ninety".